Abstract

Oberholser's resurrection of Bubo virginianus occidentalis Stone (considered by Stone himself as a synonym of B. v. subarcticus) has confused the understanding of the distribution of midcontinental populations of the great horned owl. With the clarification of the taxonomy, B. v. subarcticus proved to be the nesting populations in the prairie-parklands of Wyoming, Montana and North Dakota. Introgression with adjacent subspecies occurs at least in western Montana and in South Dakota.

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